linux-kernel - RE: [PATCH v5 9/9] Documentation: virtual: kvm: Support vcpu preempted check

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6DB0207B44@AcuExch.aculab.com>
Date:   Fri, 21 Oct 2016 11:27:55 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Pan Xinhui' <xinhui.pan@...ux.vnet.ibm.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "xen-devel-request@...ts.xenproject.org" 
        <xen-devel-request@...ts.xenproject.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>
CC:     "kernellwp@...il.com" <kernellwp@...il.com>,
        "jgross@...e.com" <jgross@...e.com>,
        "rkrcmar@...hat.com" <rkrcmar@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "will.deacon@....com" <will.deacon@....com>,
        "borntraeger@...ibm.com" <borntraeger@...ibm.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "paulus@...ba.org" <paulus@...ba.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>,
        "boqun.feng@...il.com" <boqun.feng@...il.com>
Subject: RE: [PATCH v5 9/9] Documentation: virtual: kvm: Support vcpu
 preempted check

From: Pan Xinhui
> Sent: 20 October 2016 22:28
> Commit ("x86, kvm: support vcpu preempted check") add one field "__u8
> preempted" into struct kvm_steal_time. This field tells if one vcpu is
> running or not.
> 
> It is zero if 1) some old KVM deos not support this filed. 2) the vcpu is
> preempted. Other values means the vcpu has been preempted.
> 
> Signed-off-by: Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>
> ---
>  Documentation/virtual/kvm/msr.txt | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/virtual/kvm/msr.txt b/Documentation/virtual/kvm/msr.txt
> index 2a71c8f..3376f13 100644
> --- a/Documentation/virtual/kvm/msr.txt
> +++ b/Documentation/virtual/kvm/msr.txt
> @@ -208,7 +208,8 @@ MSR_KVM_STEAL_TIME: 0x4b564d03
>  		__u64 steal;
>  		__u32 version;
>  		__u32 flags;
> -		__u32 pad[12];
> +		__u8  preempted;
> +		__u32 pad[11];
>  	}

I think I'd be explicit about the 3 pad bytes you've left.

	David